Suzuki - Forenza :: 2006 - Old Battery And Rate Of Parasitic Drain?

I have a 2006 Suzuki Forenza with original battery, so it's been about 9.5 years now. Yesterday, I couldn't start the car, and it made a few rapid clicks on trying to start it. I didn't have time to deal with it so took a spare car to work. Came home to check/try the car and it had so little charge that dashboard lights, automatic door locks, etc. didn't work, the warning indicator lights that light up on turning power on barely lit up. Seems like the battery was nearly discharged. I'm attempting to have it charged with an external charger right now to check on the car later (and try to check for parasitic drain), have the battery tested, and bring the car to mechanic for a more thorough inspection (I'm not a car person).

I was just wondering though in the meantime: did I get lucky to get nearly 10 years of life out of a car's factory installed battery? and that it's likely time for a new battery regardless of whether the battery still holds charge? The car was working fine the previous day, I never had to jump start the car. Although I had trouble starting car once or twice in the past, but that just required waiting a bit and attempting to start car again - may have been warm weather related. It just failed yesterday, and I don't recall leaving headlights on or things like that. I'm just wondering had my car been parasitically draining already and just hit a critical point yesterday (slow drain before but faster drain at some point like yesterday), or can parasitic drain just happen all of a sudden like fine one day, then some drain/short the next that kills the battery.